body {
    font-family: Tahoma,Verdana,Arial;
    font-size: 12px;
    color: #444;
}

#m_main {
    width: 600px;
    margin: auto;
}

#m_menu {
    width: 100%;
    margin-top: 20px;
    margin-bottom: 20px;
}

#m_body {
    width: 100%;
}